In Singapore many male homosexual couples are also macho/effeminate gay pairings. Two effeminate gays ('ah guas') will never be in a love relationship because they view themselves as 'sisters of the hood' (阿姐) and to have sex with each other would be akin to incest.
This distinction is less clear in Western gay communities, where 2 effeminate gays or 2 macho gays can be couples.